I wouldn’t be surprised if there was some practical effects at play but it honestly looked too simplified to be real. Crushing a lot of stuff like that would be messy and ugly. Also unsafe with things like broken metal and shattered glass. It’s feels more like CGI. And personally I think that would be the better way to do it. As someone who’s watched a weirdly high number of YouTube videos of things getting crushed by presses, it’s not pretty like that video was.

If, and if think that’s a big if that was mainly practical effects, then those props would almost certainly be fake instruments made from different materials that crush in more visually appealing ways.